Deactivate AFM?

[ChickenForker]

Just picked up a 2013 Denali with the beloved AFM.....I have the ability to disable it, should I? Or should I just leave it alone?

 

[mfdrookie516]

I know a lot of guys with silverado/sierras are gaining economy by disabling it. I disabled mine about 25 seconds after signing the paperwork, so I can't say whether or not it helped with mileage... but to not have it hesitate when I hammer it is nice.

 

[AZSCTACO]

Disabled mine....lost about 0.5-1 mpg but the hesitation and the drone is gone, so I'm happy

 

[08grey]

The new 2013 has afm on the 6.2. I thought the 6.2 was sans afm.

 

[TheFuzz]

AFM is present on Yukon/Escalade models, but the Sierra/Silverado do not have it.

 

[08grey]

What year did it start to come in the 6.2. Did they ever solve the oil consumption issue it creates.

 

[doubletapdrew]

2010. Not sure about oil consumption, mine doesn't burn any.

 

[felixgun]

The new 2013 has afm on the 6.2. I thought the 6.2 was sans afm.

The Denali did not get AFM until '09 and the esky got it in '10.

 

[08grey]

Afm was famous for all the 5.3 motor problems in the previous years. I can tell you that mpg is going to be a hard swallow if you are not used to stopping at the pump often.
Compare the mpg difference and make the decision, if it makes any at all.

I say toss it and tune that puppy out.

 

[mfdrookie516]

FWIW, I'm getting 21.5 mpg average on the highway with a level kit, 275/55/20 AT's running 28psi, and the Diablo tune using 93 octane... and no AFM. I lost .5 mpg when I leveled it, as I've noticed it tends to upshift more than it did before (might have something to do with not having an alignment afterwards? lazy me).

 

[felixgun]

That's amazing mpg. What year is your car?

---------- Post added at 03:26 PM ---------- Previous post was at 03:25 PM ----------

Oh and also get an alignment asap. Definitely necessary after a leveling kit.

 

[mfdrookie516]

It's a 2010. Mind you, to get that, I'm driving somewhere in the neighborhood of 63 MPH haha. If I bump it up to 73, I drop down to low to mid 18's.

Only reason I'm holding off on the alignment is the notion of me getting a 3.5 lift... which would result in yet another $79...

 

[08grey]

It's so hard to drive the 6.2 60mph. It's such a tease

 

[mfdrookie516]

oh... wow. Ummm, maybe if I had read, I'd realize why 21.5 and amazing mpg are in the same sentence. I have a 5.3 hoe. So, perhaps that changes things and explains the loss in mpg in deactivating AFM by someone else.

 

[ChickenForker]

So we took a road trip as soon as we drove it off the lot....Ive noticed that the only time it comes on over 65mph is when coasting down a hill. At 65mph and below, it sporadically comes on if Im on a perfectly flat road that requires virtually no movement of the go peddle. It's seems really weird to me......so I think it's gonna go. On a side note, the quality on the Denali's has really nosed dive since 2007. I think I want our 07 back!!

 

[08grey]

Truck is going to be learning your driving style for a while. Drive it easy for a while then like you stole it.

 

[GM Customer Service]

Just picked up a 2013 Denali with the beloved AFM.....I have the ability to disable it, should I? Or should I just leave it alone?

Hey!

Congrats on your new Denali. Enjoy!

Amber N.
GMC Customer Care